The two-surface theory consists of a yield surface and a loading surface. in which the surface may be defined diffrerently (axial and torsional). A Simulation experimental study on the inelastic behavior of tubular annealed alluminum alloy Alumina Duroll tubular specimens subjected to combined axial and torsional stress cycles is presented. Particular attention is paid to the question... https://mabelandfoxs.shop/product-category/measure-board/